opportune
发表于 2025-3-28 17:32:43
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Mechanics
发表于 2025-3-28 19:34:37
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LAVE
发表于 2025-3-29 01:15:05
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疲劳
发表于 2025-3-29 03:12:13
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faucet
发表于 2025-3-29 08:58:21
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开花期女
发表于 2025-3-29 14:31:39
https://doi.org/10.1057/9781403982858 determine which transformations preserve beads. We give conceptually easy first-order complete query languages and computationally complete query languages for trajectory databases, which allow to talk directly about speed and beads. The queries expressible in these languages are invariant under speed- and bead-preserving transformations.
Trigger-Point
发表于 2025-3-29 17:08:25
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membrane
发表于 2025-3-29 23:18:14
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晚来的提名
发表于 2025-3-30 00:41:01
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ILEUM
发表于 2025-3-30 04:39:45
Contested Bodies of Childhood and Youtht conjunctive queries – in fact, no monotonic language is sufficiently powerful. We also exhibit several well-behaved classes of conjunctive views and queries for which conjunctive rewritings remain sufficient. This continues a previous investigation of rewriting and its connection to semantic determinacy, for various query and view languages.